3e74e2e3bb
Normally one would dlopen() a shared object's basename, not its absolute
path. However, lib/krb5/plugin.c, in an effort to be zero-conf-ish,
wants to readdir() to find plugins to load, and in the process it ends
up defeating the RTLD's search-the-caller's-rpath.
This commit partially addresses this by allowing the use of $ORIGIN in
plugin_dir values and using them for the default (except on OS X).
This allows multiple Heimdal versions installed on the same host, but
with different plugin ABIs, to co-exist. A step forward for doing make
check on hosts where Heimdal is installed.
For now we hardcode $ORIGIN/../lib/plugin/krb5 (linux, Solaris, *BSD),
or $ORIGIN (Windows; for assemblies objects need to be in the same
directory) and we eval $ORIGIN by using dladdr() (Linux, Solaris) or
GetModuleHandleEx() (Win32, via a dladdr() wrapper in libroken) to find
the path to libkrb5 whose dirname to use as $ORIGIN. For Windows,
because we need the plugins to be in the same directory as libkrb5, we
require a prefix on plugin DLLs ("plugin_krb5_") to distinguish them
from other objects.
We should add a special token to mean "look in $ORIGIN, sure, but
dlopen() the plugin basenames only (so the RTLD can search the rpath)".
90 lines
2.5 KiB
Plaintext
90 lines
2.5 KiB
Plaintext
/***********************************************************************
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* Copyright (c) 2009, Secure Endpoints Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**********************************************************************/
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#ifndef __dlfcn_h__
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#define __dlfcn_h__
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#include <windows.h>
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#ifndef ROKEN_LIB_FUNCTION
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#ifdef _WIN32
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#define ROKEN_LIB_FUNCTION
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#define ROKEN_LIB_CALL __cdecl
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#else
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#define ROKEN_LIB_FUNCTION
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#define ROKEN_LIB_CALL
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#endif
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#endif
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#ifdef _WIN32
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typedef int (__stdcall *DLSYM_RET_TYPE)();
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#else
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#define DLSYM_RET_TYPE void *
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#endif
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#ifdef __cplusplus
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extern "C"
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#endif
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/* Implementation based on
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http://www.opengroup.org/onlinepubs/009695399/basedefs/dlfcn.h.html */
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#define RTLD_LAZY (1<<0)
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#define RTLD_NOW (1<<1)
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#define RTLD_GLOBAL (1<<2)
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#define RTLD_LOCAL (1<<3)
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ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
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dlclose(void *);
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ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
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dlerror(void);
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ROKEN_LIB_FUNCTION void * ROKEN_LIB_CALL
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dlopen(const char *, int);
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ROKEN_LIB_FUNCTION DLSYM_RET_TYPE ROKEN_LIB_CALL
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dlsym(void *, const char *);
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typedef struct Dl_info {
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char *dli_fname;
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char _dli_buf[MAX_PATH + 2];
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} Dl_info, Dl_info_t;
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* __dlfcn_h__ */
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